BoilerFaultCodesWhat the manual says
Manufacturer manualFlame goes off during operation and subsequent ignition attempts failed
What causes this fault?
This fault occurs when your boiler successfully starts but cannot maintain a steady flame while it is running, leading the system to shut down for safety. The most common reasons include a temporary interruption in your gas supply, a build-up of carbon on the ignition sensors, or a component failure that prevents the correct mix of gas and air from reaching the burner.
This issue is more frequent during extreme cold spells, as freezing temperatures can cause external gas regulators to stick or condensate pipes to freeze and back up into the boiler.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Avoid the next call-out bill
A cover plan would handle faults like F.29: no call-out fees, no surprise bills.
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